Siemens Power Transmission & Distribution, Inc. announced its entry into the extra high voltage (EHV) dead tank circuit breaker and controlled switching markets at the IEEE Power Engineering Society T&D show in Dallas, Texas. Siemens introduced the SPS2 550 kV SF6 dead tank circuit breaker with a spring-spring operator and a controlled switching device.

The Siemens SPS2 550 kV dead tank is a compact design with features meeting or exceeding both ANSI and IEC requirements. Its the arc-assist interrupters use a spring-spring mechanism for 2-cycle operation. The units are available with porcelain or composite bushings, customized control schemes and optional pre-insertion resistors.

Low installation cost and minimal maintenance make this unit ideal given the current trend toward maintenance-free equipment. The compact design reduces shipping cost, decreases foundation requirements and minimizes SF6 gas requirements. The bushing assembly process is designed to minimize field labor and effort and the interrupter assemblies are designed to roll out for quick inspection if required.

Siemens also introduced the PSD02 controlled switching device for use in both ungrounded and grounded applications. The current SPS2 dead tank product line, from 72 kV thru 245 kV, is configured for independent pole operation and ganged operations. By combining the controlled switching capability with the reliable FA series of spring-spring mechanical operators, supplied as standard equipment on all Siemens dead tank breakers, electric utilities can increase their system reliability and extend their equipment life.